纸张断裂声发射的统计：前兆和临界性
Statistics of acoustic emission in paper fracture: precursors and criticality
摘要：
我们提出了统计分析的声发射（AE）数据从纸张上的拉伸实验，加载模式I，与应变控制下的样品破裂。结果是基于100个无缺口样品和70个具有长初始边缘缺口的样品的实验。首先，AE能量释放和AE事件率被认为是两种情况下，测试的“临界点”的存在下，在骨折。对于AE能量，没有发现明确的签名，而主要的发现是，当接近最大事件率的样本依赖的“临界时间”时，事件率发散。这发生在达到最大应力之后。结果与非均匀材料的统计断裂模型进行了比较。我们还讨论了AE能量和事件间隔分布对平均事件率的依赖性。
英文摘要：
We present statistical analysis of acoustic emission (AE) data from tensile experiments on paper sheets, loading mode I, with samples broken under strain control. The results are based on 100 experiments on unnotched samples and 70 samples with a long initial edge notch. First, AE energy release and AE event rates are considered for both cases, to test for the presence of "critical points" in fracture. For AE energy, no clear signatures are found, whereas the main finding is that the event rate diverges when a sample-dependent "critical time" of the maximum event rate is approached. This takes place after the maximum stress is reached. The results are compared with statistical fracture models of heterogenous materials. We also discuss the dependence of the AE energy and event interval distributions on average event rates.
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